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Colour in M42
Good night of observing around Sydney last night with many of the main eye candy objects.
Seeing 6-8/10
Transparency 7-5/10
10" f/5 GSO Dob
The big surprise came right at the beginning, M42 Orion nebula. Tried to locate it, just for fun, in strong twilight. Rigel and Betelgeuse had just become visible naked eye in a clean sky. Could not see Bellatrix or Saiph yet.
M42 was found, and only the brightest areas were visible (no surprises there). BUT: a turquiose hue was immediately obvious. Not sure what was going on, but it may be to do with the colour of the surrounding twilight sky providing a colour contrast. I had seen colour in M42 before, but never the instant I saw the nebula. Eyepiece was the 16mm ES 68°, exit pupil of 3.2mm.
Last edited by N1; 08-02-2016 at 11:57 AM.
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